[Automated Cable-laying System: water tank test has been carried out successfully]
An automated cable-laying system has been developed for DONET2 construction and tested in the water tank of Research Institute of Applied Mechanics, Kyushu University during June 18-22, 2012. The cable-laying system used for DONET was controlled by the operator on the research vessel and the cable-laying work was regarded as one of the hardest works. In order to reduce the physical and mental burden imposed on the operator and speed up the DONET2 construction, the development of an automated cable-laying system has been started. The automated cable-laying system can pay out the cable using two electric motors which respectively rotate the cable bobbin and the sheave and the paying out speed is automatically controlled to keep balance with the moving speed. The moving speed is measured by DVL (Doppler Velocity Log). During the water tank test, the characteristics of the motors and sensors were investigated and the control system was tested. It was verified that the automated cable-laying system can be successfully and correctly operated. In addition, the automated cable-laying system will be tested in real sea on July 5-9, 2012.